In a 2010 paper (available here and here and here), Lynne Sullivan and Shannon Koerner describe a circular post structure at the DeArmond Site (40-Re-12), Roane County, Tennessee. WPA excavations at the site produced features, debris, and architectural remains, much of which was attributable to Mississippian occupations. Sullivan and Koerner argue that the single circular structure from the site (Feature 30) predates the Mississippian occupation and is Late Woodland in age. As shown in the illustration to the right (from Sullivan and Koerner 2010:39), the structure was of single post construction and measured approximately 8.2 m in diameter. The structure will be added to the database as Structure 2255. I thank Dr. Sullivan for bringing the paper to my attention.